A "high speed USB controller" is needed for USB-2 devices to operate at full speed. If you have an older computer that does not have USB2 hardware then there is no way to install a usb2 controller. Each time you plug a USB2 device into a older computer without USB2 hardware you will automatically get this message.
If you have a newer computer that has USB2 hardware you should be able to download the driver from SONY.
I hope this helps.